Expansion shield



April 14, 1931. G. R. FLORA EXPANSION SHIELD Filed Oct. 15, 1928 Patented Apr. 14, 1931 UNITED STATES PATENT OFFICE GEORGE R. FLORA, 0F MARION, OHIO, ASSIGNOR TO ARROW EXPANSION BOLT, INC., 01 MARION, OHIO, A CORPORATION OF OHIO EXPANSION SHIELD Application filed October 13, 1928.

tuting one of these devices become separated,

which needless to say, is highly undersirable. Very often one half of one of these shields which is primarily designed to be used in conjunction with a certain particular other half, is mated up with still some other part with which it does not mate properly, and the best result possible from the use of the parts is therefore not obtainable.

In view of the foregoing, my aim in making the present invention, has been to provide a construction of these two-part expansion shields which includes means for keep ing two complemental components together during handling from the manufacturer to the user. It is to be remembered that the proper usage of these devices dictates that they be readily expandible in order to function as required in providing a firm anchorage in concrete constructions of varous types such as walls, etc., and it is a further object of the invention to provide means as above noted for maintaining association between the parts, but which means do not affect in any way the spreading action on the part of the shield, which is so essential to its proper functioning.

In carrying out this idea, one of the halves of the shield at one end is provided with ears, while the other half is provided with projections in the form of ribs. The cars are bent over the ribs to provide a connecting medium at one end of the shield which is loose enough to permit of the relative expending action of the two parts.

In the use of these expansion shields one is usually inserted in an opening after which a screw member is threaded into the inner threaded bore of the shield which is tapered. This last mentioned action causes an expansion of that part of the shield which is embedded in the concrete structure It is obvious that the degree of expansion graduates downward from a high degree at the innermost extremity of the shield to comparative- 1y nothing at the outer end. \Vith this phase Serial No. 312,351.

of operation, another more detailed object arises. I propose to provide an expansion shield of such construction that when driven into a hole in a concrete structure, the outer end will have a tendency to contract or collapse due to the driving in action. This is attained by providing on the outer surface of the parts of the shield adjacent to one end, ribs which have a tapered relationship with respect to one another. The action of the concrete on these ribs is such that there is a tendency for the end of the shield to be contracted around the screw member, which affords a much more etficient anchorage.

With these and other more detailed objects and advantages in view as will in part become apparent and in part be hereinafter stated, the invention comprises certain novel constructions, combinations, and arrangements of parts as will be subsequently specified and claimed.

For a full and more complete understanding of the invention, reference may be had to the following description and accompanyin g drawings, in which- Figure 1 is a View in section of a shield as embedded in' a concrete structure with the screw member shown in elevation, while the shield and concrete are in section.

Figure 2 is a view in side elevation of one of the shields as assembled and not expanded.

Figure 3 is a longitudinal section taken about on the line 3-3 of Figure 4, while Figure l is a transverse section taken about on the line l-4 of Figure 2.

Figure 5 is a detailed showing in per-sped tive bringing out particularly the fastening means between the parts and the shield.

Figure 6 is another detail perspective illustration that develops particularly the construction and location of the cars which constitute a part of the fastening means,.and

Figure 7 is a detail showing in elevation of one end of one of the parts of the shield showing the relative arrangements of the tapered ribs.

While a preferred specific embodiment of the invention is herein set forth, it is to be understood that I amnotto be limited to the exact constructions illustrated and described,

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pended claims.

because various modifications of these details may be provided 111 putting the inventlon into practice withln the purvlew of the ap- In the drawings, the concrete structureis shown somewhat fragmentarily and is referred to by the reference character A. In the ordinary use of these expansion shields,

concrete A is provided with a bore B in which tions inasmuch as the use of this metal pro vides for the easy manufacture of the de- V1068. When the two parts 1 and 2 are assembled, they define interiorly thereof, a

tln'eaded-tapered' bored as clearly shown in Figure 3. This bore terminates in a cylindrical part 5 which is of a smooth nature. The part 2 is provided with ears 6 which are bent down over ribs 7 in order to provide the fastening medium between the parts 1 and 2. It will become apparent from an observation of Figure d that this connection is looseand permits of the expansion of the parts 1 and 2 due to the threading'of ascrew member 8 into the bore 4 andyet it is suifi' cient to hold the parts assembled during ban:- dling.

V Gn the outer surface of the shield at the end which is formed with the smooth bore 5, the parts 1 and 2 are each provided with ribs 9 which are angular-1y disposed with respect to one another, as is clearly shown in Figure 7. As previously mentioned, these ribs 9 have a tendency to contract or collapse the cylindrical portion 5 when the shield is driven into bore B.

.Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States, is 7 1. An expansion shield of the class described, comprising, in combination, two members defining a tubular'structure, and means for fastening the two members together at one point so as to permit of their relative expansion at other points, said-means consisting of a solid tapering ear on one memberand arib. extending from the periphery of the other, the outer end of the ear on the first member'being bent over the rib of the other member thereby making a lciose joint permitting a restricted amount of P y- 2. An expansion shield of the class de+ scribed,lcomprising,in combination, a. pair of members defininga tubular structure, and means for fastening the saidmembers-togetherratone point soasto permit of their These parts may be made relative expansion at other points, said means comprising integral ears on one member at its outer end and longitudinal ribs extending from the periphery of the other member of a length approximately equal to the width of the ears at their bases, the said-longitudinal ribs being disposedbetween;a'flange adjacent to the end of the members and a spaced annular rib providing a defined space for the ears, saidlongitu'dinal" ribs forming fulcrums over which the ears of the other member are bent whereby to interlock the members to prevent separation .of the same, the longitudinal rib provided member also being provided with spaceddiverging inclined ribsadapted to'collapse the shield when driven into. ahole in concrete. or the like. 7 V

In testimony whereof I. ah'ix my signature.

GEORGE: R. FLO-RA. 

